iBook - Installed Leopard and now I can't get past the Gray Screen

I have an iBook g4 14" display.. the one that came out right before the intel macbooks. I installed Leopard and went through the entire process.. once it was done installing it said i had to restart my computer before continuing.. i clicked the restart button (which popped up in window telling me that the software had successfully been installed and to click restart).. my computer restarted and won't get past the gray screen w/the apple logo and the spinning wheel.. i tried the whole command, option, p, r and still no luck.. i also tried the reset: shift, control, option, power.. didn't work.. is there any way to fix my computer or is it worthless now..? please help!

not many option's available.. i was just told to erase and install.. i only have the first disc.. or at least that's what i think.. let me list the CDs i do have.. hah sorry.. note: my first mac was a 17" iMac which i got (still have) around late 2003.. so i have every one of those discs.. which are mixed in w/my sisters discs who go her iMac a year before me, late 2002.. confusing, yes?
iMac: Software Restoration 1-4: Mac OS Versions 10.1.5, 9.2.2 Version 1
iMac: Mac OS X Install Version 10.1.4
iMac: Applications CD Version 1.5
iBook G4: Mac OS X Disc 1 Mac OS Version: 10.4.2 AHT Version: 2.5 Disc Version: 1.0
Mac OSX Install Disc 2 Disc Version: 1.3
pleeeeease let me know if there's anything i can do!! there must be some sort of solution!